Device and method for measuring runout of brake drum and brake disc

Abstract

The invention provides a brake drum and brake disc jerk value measuring device and method.The measuring device comprises a reference table top, a height supporting frame, a rotating assembly, a clamping assembly and a measuring assembly, the upper surface of the reference table top is a horizontal plane, and the reference table top is provided with the height supporting frame; the height supporting frame is arranged upwards to have the supporting height enabling the brake drum and the brake disc to be suspended in the lateral direction, a rotating assembly is arranged on the height supporting frame and axially connected with the brake drum and the brake disc through a clamping assembly, the brake drum and the brake disc are both axially and transversely arranged and rotate circumferentially along with the rotating assembly, and the measuring assembly is based on the reference table top. And the measuring assembly extends to contact the measured surfaces of the brake drum and the brake disc, and the measuring assembly obtains the surface runout in the rotation process of the brake drum and the brake disc. The reference table board provides a reference position for measurement, and the measured part and the measuring part both adopt the same reference, so that the measurement accuracy is high, and the measurement is convenient.

Description

Technical Field

[0001] The present invention relates to a production detection device for automobile braking devices, in particular to a device and method for measuring the runout of a brake drum and a brake disc. Background Art

[0002] Automobile brakes are mainly divided into disc brakes and drum brakes. Disc brakes mainly achieve braking deceleration through the friction between the brake and the brake disc, while drum brakes achieve deceleration through the surface friction between the brake shoe and the brake drum. Both types of brakes are widely used in automobiles, and some vehicles use front-wheel disc and rear-wheel drum braking. Therefore, both types of brake parts need to be mass-produced at the same time. In addition, both types of brakes need to measure the runout of the brake contact surface during manufacturing to ensure braking accuracy. If the runout is too large, there will be problems such as brake pedal rebound, affecting driving comfort. Therefore, a device and measurement method that can measure the working surfaces of both brake drums and brake discs are needed. Summary of the Invention

[0003] The purpose of the present invention is to overcome the above-mentioned deficiencies in the prior art and to provide a device for measuring the runout of a brake drum and a brake disc and a method for measuring the same.

[0004] The technical solution adopted by the present invention to solve the above-mentioned problem is: the measuring device includes a reference table, a height support frame, a rotating assembly, a clamping assembly and a measuring assembly. The upper surface of the reference table is a horizontal plane. The height support frame is arranged on the reference table. The height support frame is upwardly arranged to a support height that allows the brake drum and the brake disc to be laterally suspended. A rotating assembly is arranged on the height support frame. The rotating assembly is axially connected to the brake drum and the brake disc through the clamping assembly. The brake drum and the brake disc are both axially arranged and rotate circumferentially with the rotating shaft in the rotating assembly. The measuring assembly is based on the reference table and extends to contact the measured surface of the brake drum and the brake disc. During the rotation process of the brake drum and the brake disc, the surface runout is obtained through the measuring assembly. The reference table provides a reference position for measurement. The measured part and the measuring part use the same reference, and the measurement accuracy is high. The height support frame provides the support height, and the brake drum and brake disc bearings are horizontally set at a suitable height to facilitate measurement. The rotating assembly provides a low-resistance rotation function for the measured brake drum and brake disc. The brake clamping assembly is a positioning connection structure that is precisely fixed to the brake drum and brake disc. It is a high-precision coaxial connection method with the measured brake drum and brake disc to reduce the impact on the measured runout. The measuring assembly uses a contact measuring assembly to directly measure the surface of the structure. The obtained values ​​are accurate and convenient for recording and comparison.

[0005] Furthermore, the height support frame includes an x-axis support, a y-axis support, and an upper platform. The x-axis support and the y-axis support are arranged at right angles to each other and supported and fixed on the reference table. The x-axis support and the y-axis support are of the same height and are fixedly connected to the upper platform on top. The upper platform is arranged horizontally, and the x-axis support and the y-axis support are fixedly connected to each other by fasteners. The height support frame includes at least two supports with different support conveniences to form a stable support structure. The supports in the two directions are also connected by fasteners to prevent structural loosening. The support height is required to be high enough to allow the brake drum and brake disc to be suspended in the air.

[0006] Furthermore, the rotating assembly is fixed to the upper surface of the upper platform and includes a bearing seat, a bearing group, a bearing fixing member, and a rotating shaft. The bearing seat is mounted on the upper platform and has an axial hole in which a bearing group is disposed. The bearing group comprises two or more single bearings coaxially disposed in the axial hole. The rotating shaft is connected to the inner hole of the bearing group and is connected to the clamping assembly. The rotating assembly utilizes a grouped bearing structure to effectively control the axial offset of the rotating shaft. The bearing fixing member secures the bearing in position to prevent axial movement during rotation.

[0007] Furthermore, all individual bearings in the bearing assembly are spaced apart, with spacing sleeves positioned between them. These sleeves press against the inner rings of the individual bearings. The bearing retainer, anchored to the bearing seat, applies pressure to the outer ring end faces of the individual bearings to position the bearing assembly within the shaft bore. The spacing between the bearings increases the distance between the rotating bearings, enhancing the structural strength of the rotating shaft supporting the brake drum and disc. The spacing sleeves secure the bearing rings to prevent vibration during rotation.

[0008] Furthermore, the clamping assembly includes an axial fixing member, a fixing screw, and a limiting sleeve. The axial fixing member is formed with a stepped body that fills the inner holes of the brake drum and brake disc. The axial fixing member covers the mounting holes of the brake drum and brake disc and has holes corresponding to the mounting holes. The axial fixing member is coaxially arranged with the brake drum and brake disc and is fixed by installing a fixing screw in the mounting hole. The stepped body of the axial fixing member is fully mated with the inner holes of the brake drum and brake disc, forming a good axial fixation with high concentricity. The fixing screw is connected to ensure high precision connection between the entire clamping assembly and the brake drum and brake disc.

[0009] Furthermore, the limiting sleeve includes a front limiting sleeve and a rear limiting sleeve, both of which are sleeved on the rotating shaft. One end of the rear limiting sleeve is tightened against the inner ring of the bearing assembly, and the other end is tightened against the clamping assembly. One end of the front limiting sleeve is tightened against the clamping assembly, and the other end is tightened by a bolt screwed onto the rotating shaft. The front limiting sleeve and the rear limiting sleeve respectively connect to the axial fixing member on both sides, thereby improving the connection accuracy of the clamping assembly.

[0010] Furthermore, the measuring assembly includes a movable base, a height adjustment rod, and an angle adjustment rod. The movable base can be fixed at any planar position on the reference table. The height adjustment rod is connected to the movable base via a single-hole adjustment member, and the angle adjustment rod is connected to the height adjustment rod via a double-hole adjustment member. A measuring gauge is connected to the end of the angle adjustment rod, and the detection end of the measuring gauge contacts the test surface of the brake drum or brake disc. The movable base of the measuring assembly can adopt a magnetic base, which can be magnetically attracted and fixed to the reference table. The degrees of freedom provided by the height adjustment rod and the angle adjustment rod can achieve the purpose of approaching the brake drum or brake disc, and the measuring gauge can be fixed to obtain stable measurement values.

[0011] A method for measuring the runout of brake drums and brake discs using the aforementioned runout measuring device is disclosed. Prior to measurement, the reference table is cleaned to remove particles and debris, and the measurement step is performed. The reference table is used as the measurement reference, and the brake drum and brake disc are coaxially mounted with a clamping assembly, which is axially connected to a rotating assembly. The relative positions of the brake drum, brake disc, and reference table are fixed, and the brake drum, brake disc, and brake disc rotate in a circular motion about the axis of the rotating assembly. The measuring assembly, with the reference table as the reference, extends a measuring gauge upward and toward the brake drum and brake disc. The probe end of the measuring gauge contacts the measured surface until the gauge displays a value. After calibrating the gauge, the brake drum and brake disc are rotated while observing and recording the value displayed on the gauge. The obtained value is compared with the reference value to determine whether the runout is acceptable. This measurement method is applicable to both brake drums and brake discs, and the obtained values ​​are highly accurate, with small deviations, simple operation, and high work efficiency.

[0012] Furthermore, when the clamping assembly is coaxially mounted with the brake drum and disc, and the step body is aligned with the rotating assembly, the radial deviation of the step body is less than 0.02 mm. The coaxiality of the clamping assembly connection is controlled, as is the coaxiality between the clamping assembly and the rotating assembly, effectively controlling errors. Because the clamping assembly and the rotating assembly are the basic structures of the measuring device, their precision control requires even higher standards.

[0013] Furthermore, when measuring a brake drum, the inner circumference of the drum is used as the measuring surface. When measuring a brake disc, the circular surface on one side of the disc is used as the measuring surface. After the measurement, the measuring assembly is moved and the other side of the disc is measured. The parts of the brake drum and disc that are measured are the main contact areas with the brake pads. During braking, these areas are the primary friction surfaces and have the greatest impact on braking performance.

[0014] Compared with the prior art, the present invention has the following advantages and effects: This design is a device for measuring the runout of brake drums and brake discs, which can be used to universally measure brake drums and brake discs. It has high structural precision, is easy to control measurement errors, is easy to operate, and is suitable for large-scale production processes. At the same time, using this device, a measurement method can be generated that can be universally applied to brake drums and brake discs, and can quickly measure the surfaces that need to be tested, with high work efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a schematic diagram of the structure of the measuring device for measuring the brake drum.

[0016] Figure 2 It is a schematic diagram of the structure of a measuring device for measuring brake discs.

[0017] Figure 3 It is a structural diagram of the rotating component and the clamping component.

[0018] In the figure: 1. Reference table, 2. Height support frame, 3. Rotating assembly, 4. Clamping assembly, 5. Measuring assembly, 21. X-axis support body, 22. Y-axis support body, 23. Upper platform, 31. Bearing seat, 32. Bearing group, 33. Bearing fixing part, 34. Rotating shaft, 35. Shaft hole, 36. Single bearing, 37. Distance keeping sleeve, 41. Axial fixing part, 42. Fixing screw, 43. Step body, 44. Front end limit sleeve, 45. Rear end limit sleeve, 6. Brake drum, 7. Brake disc, 51. Movable base, 52. Height adjustment rod, 53. Angle adjustment rod, 54. Single hole adjustment part, 55. Double hole adjustment part. DETAILED DESCRIPTION

[0019] The present invention will be further described in detail below with reference to the accompanying drawings and through examples. The following examples are intended to explain the present invention but the present invention is not limited to the following examples.

[0020] Example 1, the measuring device includes a reference table 1, a height support frame 2, a rotating component 3, a clamping component 4 and a measuring component 5, the upper surface of the reference table 1 is a horizontal plane, the height support frame 2 is arranged on the reference table 1, the height support frame 2 is upwardly set to a support height that makes the brake drum 6 and the brake disc 7 laterally suspended, and a rotating component 3 is arranged on the height support frame 2, the rotating component 3 is axially connected to the brake drum 6 and the brake disc 7 through the clamping component 4, the brake drum 6 and the brake disc 7 are both axially arranged and rotate circumferentially with the rotating shaft 34 in the rotating component 3, the measuring component 5 is based on the reference table 1, and extends to contact the measured surface of the brake drum 6 and the brake disc 7, and the surface runout of the brake drum 6 and the brake disc 7 is obtained through the measuring component 5 during the rotation process.

[0021] The height support frame 2 includes an x-direction support body 21, a y-direction support body 22 and an upper platform 23. The x-direction support body 21 and the y-direction support body 22 are arranged at right angles to each other and are supported and fixed on the reference table 1. The x-direction support body 21 and the y-direction support body 22 have the same height and are fixedly connected to the upper platform 23 on the top. The upper platform 23 is arranged horizontally, and the x-direction support body 21 and the y-direction support body 22 are fixedly connected to each other by fasteners.

[0022] The rotating assembly 3 is fixed on the upper surface of the upper platform 23. The rotating assembly 3 includes a bearing seat 31, a bearing group 32, a bearing fixing part 33, and a rotating shaft 34. The bearing seat 31 is installed on the upper platform 23. The bearing seat 31 has an axial hole 35. A bearing group 32 is arranged in the axial hole 35. The bearing group 32 is two or more single bearings 36 coaxially arranged in the axial hole 35. A rotating shaft 34 is connected to the inner hole of the bearing group 32, and the rotating shaft 34 is connected to the clamping assembly 4.

[0023] All the individual bearings 36 of the bearing group 32 are arranged at intervals, and a distance maintaining sleeve 37 is provided between the individual bearings 36. The distance maintaining sleeve 37 is set to tighten the inner ring of the individual bearing 36. The bearing fixing part 33 uses the bearing seat 31 as a fixed base and applies a tightening pressure to the outer ring end face of the individual bearing 36 to position the bearing group 32 in the shaft hole 35.

[0024] The clamping assembly 4 includes an axial fixing part 41, a fixing screw 42 and a limiting sleeve. The axial fixing part 41 is formed with a step body 43. The step body 43 is filled and arranged corresponding to the inner holes of the brake drum 6 and the brake disc 7. The axial fixing part 41 covers the mounting holes of the brake drum 6 and the brake disc 7, and opens holes corresponding to the mounting holes. The axial fixing part 41 is coaxially arranged with the brake drum 6 and the brake disc 7 and is fixed by installing the fixing screw 42 on the mounting hole.

[0025] The limiting sleeve includes a front-end limiting sleeve 44 and a rear-end limiting sleeve 45, and both are sleeved on the rotating shaft 34. One end of the rear-end limiting sleeve 45 is tightened against the inner ring of the bearing group 32, and the other end is tightened against the clamping component 4. One end of the front-end limiting sleeve 44 is tightened against the clamping component 4, and the other end is tightened by a bolt screwed on the rotating shaft 34.

[0026] The measuring assembly 5 includes a movable base 51, a height adjustment rod 52, and an angle adjustment rod 53. The movable base 51 is fixed at any plane position on the reference table. The height adjustment rod 52 is connected to the movable base 51 through a single-hole adjustment member 54. The angle adjustment rod 53 is connected to the height adjustment rod 52 through a double-hole adjustment member 55. A measuring meter is connected to the end of the angle adjustment rod 53, and the detection end of the measuring meter contacts the detected surface of the brake drum 6 and the brake disc 7.

[0027] Example 2, a measurement method commonly used for brake drums and brake discs. Before measurement, the reference table is cleaned to remove particulate matter, and the measurement step is entered. The reference table is used as the measurement reference. The brake drum 6 and brake disc 7 are coaxially installed with the clamping component 4 respectively. The clamping component 4 is axially connected to the rotating component 3. The relative positions of the brake drum 6, brake disc 7 and the reference table are fixed, and they rotate in a circle around the axis of the rotating component 3. The measuring component 5 is based on the reference table. A measuring table is extended upward and toward the brake drum 6 and brake disc 7. The detection end of the measuring table contacts the measured surface until the measuring table displays a value. After calibrating the measuring table, rotate the brake drum 6 and brake disc 7, and observe and record the values ​​displayed on the measuring table. The obtained values ​​are compared with the reference values, and it is determined whether the runout is qualified.

[0028] When the clamping assembly 4 is coaxially installed with the brake drum 6 and the brake disc 7 , and when the step body 43 is assembled with the rotating assembly 3 , the radial deviation of the step body 43 is less than 0.02 mm.

[0029] When measuring the brake drum 6, the inner circumferential surface of the brake drum 6 is used as the measuring surface. When measuring the brake disc 7, the circular surface on one side of the brake disc 7 is used as the measuring surface. After measurement, move the measuring component 5 and measure the other side of the brake disc.

[0030] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above and that the invention can be embodied in other specific forms without departing from the spirit or essential characteristics of the invention. Therefore, the embodiments should be considered in all respects as illustrative rather than restrictive. The scope of the invention is defined by the claims, not the foregoing description, and it is intended that all variations within the meaning and range of equivalents of the claims be embraced therein. Any reference sign in a claim should not be construed as limiting the claim to which it relates.

[0031] In addition, it should be understood that although this specification is described in terms of implementation methods, not every implementation method contains only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment can also be appropriately combined to form other implementation methods that can be understood by those skilled in the art.

Claims

1. A device for measuring the runout of a brake drum or brake disc, characterized in that: The measuring device comprises a reference table (1), a height support frame (2), a rotating assembly (3), a clamping assembly (4) and a measuring assembly (5), wherein the upper surface of the reference table (1) is a horizontal plane, a height support frame (2) is arranged on the reference table (1), and the height support frame (2) is upwardly arranged to a support height that allows the brake drum (6) and the brake disc (7) to be laterally suspended, a rotating assembly (3) is arranged on the height support frame (2), and the rotating assembly (3) is axially connected to the brake drum (6) and the brake disc (7) through the clamping assembly (4), and the brake drum (6) and the brake disc (7) are both axially arranged and rotate circumferentially with the rotating shaft (34) in the rotating assembly (3), and the measuring assembly (5) is based on the reference table (1) and extends to contact the measured surface of the brake drum (6) and the brake disc (7), and the surface runout of the brake drum (6) and the brake disc (7) is obtained through the measuring assembly (5) during the rotation process.

2. The brake drum and brake disc runout measuring device according to claim 1, characterized in that: The height support frame (2) comprises an x-direction support body (21), a y-direction support body (22) and an upper platform (23); the x-direction support body (21) and the y-direction support body (22) are arranged at right angles to each other and are supported and fixed on the reference table (1); the x-direction support body (21) and the y-direction support body (22) have the same height and are fixedly connected to the upper platform (23) on the top; the upper platform (23) is arranged horizontally; and the x-direction support body (21) and the y-direction support body (22) are fixedly connected to each other by fasteners.

3. The brake drum and brake disc runout measuring device according to claim 2, characterized in that: The rotating assembly (3) is fixed on the upper surface of the upper platform (23), and the rotating assembly (3) includes a bearing seat (31), a bearing group (32), a bearing fixing member (33), and a rotating shaft (34). The bearing seat (31) is installed on the upper platform (23), and the bearing seat (31) has an axial hole (35). A bearing group (32) is arranged in the axial hole (35). The bearing group (32) is composed of two or more single bearings (36) coaxially arranged in the axial hole (35). A rotating shaft (34) is connected to the inner hole of the bearing group (32), and the rotating shaft (34) is connected to the clamping assembly (4).

4. The brake drum and brake disc runout measuring device according to claim 3, characterized in that: All the individual bearings (36) of the bearing group (32) are spaced apart, and a distance-maintaining sleeve (37) is provided between the individual bearings (36). The distance-maintaining sleeve (37) is arranged to press against the inner ring of the individual bearing (36). The bearing fixing member (33) uses the bearing seat (31) as a fixed base and applies a pressing pressure to the outer ring end face of the individual bearing (36) to position the bearing group (32) in the shaft hole (35).

5. The brake drum and brake disc runout measuring device according to claim 3, characterized in that: The clamping assembly (4) includes an axial fixing member (41), a fixing screw (42) and a limiting sleeve. The axial fixing member (41) is formed with a step body (43). The step body (43) is filled and arranged corresponding to the inner holes of the brake drum (6) and the brake disc (7). The axial fixing member (41) covers the mounting holes of the brake drum (6) and the brake disc (7) and has a corresponding opening to the mounting hole. The axial fixing member (41) is coaxially arranged with the brake drum (6) and the brake disc (7) and is fixed by installing the fixing screw (42) on the mounting hole.

6. The brake drum and brake disc runout measuring device according to claim 5, characterized in that: The limiting sleeve includes a front limiting sleeve (44) and a rear limiting sleeve (45), and both are sleeved on the rotating shaft (34). One end of the rear limiting sleeve (45) is tightly set against the inner ring of the bearing group (32), and the other end is tightly set against the clamping component (4). One end of the front limiting sleeve (44) is tightly set against the clamping component (4), and the other end is tightly set by a bolt screwed on the rotating shaft (34).

7. The brake drum and brake disc runout measuring device according to claim 1, characterized in that: The measuring assembly (5) comprises a movable base (51), a height adjustment rod (52), and an angle adjustment rod (53). The movable base (51) is fixed at any plane position on a reference table. The height adjustment rod (52) is connected to the movable base (51) through a single-hole adjustment member (54). The angle adjustment rod (53) is connected to the height adjustment rod (52) through a double-hole adjustment member (55). A measuring meter is connected to the end of the angle adjustment rod (53). The detection end of the measuring meter contacts the detected surface of the brake drum (6) and the brake disc (7).

8. A method for measuring brake drums and brake discs using the measuring device according to claims 1 to 7, characterized in that: Before measurement, the reference table is cleaned to remove particles and debris, and then the measurement step is entered. The reference table is used as the measurement reference. The brake drum (6) and the brake disc (7) are respectively coaxially installed with the clamping component (4). The clamping component (4) is axially connected to the rotating component (3). The relative positions of the brake drum (6), the brake disc (7) and the reference table are fixed, and the brake drum (6), the brake disc (7) and the reference table are rotated around the axis of the rotating component (3). The measuring component (5) is used as the reference and extends upward and toward the brake drum (6) and the brake disc (7) to set a measuring table. The detection end of the measuring table contacts the measured surface until the measuring table displays a value. After calibrating the measuring table, the brake drum (6) and the brake disc (7) are rotated, and the values ​​displayed on the measuring table are observed and recorded. The obtained values ​​are compared with the reference values, and it is determined whether the runout is qualified.

9. The measurement method for brake drums and brake discs according to claim 8, characterized in that: When the clamping assembly (4) is coaxially mounted with the brake drum (6) and the brake disc (7), and when the step body (43) is assembled with the rotating assembly (3), the radial deviation of the step body (43) is less than 0.02 mm.

10. The measurement method for brake drums and brake discs according to claim 9, characterized in that: When measuring the brake drum (6), the inner circumferential surface of the brake drum (6) is used as the measuring surface. When measuring the brake disc (7), the circular surface on one side of the brake disc (7) is used as the measuring surface. After the measurement, the measuring assembly (5) is moved and the other side of the brake disc is measured.

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